diff --git a/lib/puppet/catalog-diff/comparer.rb b/lib/puppet/catalog-diff/comparer.rb
index 1ce6318..391d69c 100644
--- a/lib/puppet/catalog-diff/comparer.rb
+++ b/lib/puppet/catalog-diff/comparer.rb
@@ -46,7 +46,7 @@ def compare_resources(old, new, options)
           parameters_in_new[resource[:resource_id]] = \
           Hash[(new_resource[:parameters].to_a - resource[:parameters].to_a )]
 
-          if options[:show_resource_diff]
+          unless options[:no_resource_diff]
             Puppet.debug("Resource diff: #{resource[:resource_id]}")
 
             diff_array = str_diff(
diff --git a/lib/puppet/catalog-diff/differ.rb b/lib/puppet/catalog-diff/differ.rb
index c21a50a..d440905 100644
--- a/lib/puppet/catalog-diff/differ.rb
+++ b/lib/puppet/catalog-diff/differ.rb
@@ -39,23 +39,35 @@ def diff(options = {})
         when '.marshal'
           tmp = Marshal.load(File.read(r))
         when '.pson'
-          tmp = PSON.load(File.read(r))
-          unless tmp.respond_to? :version
-            if Puppet::Resource::Catalog.respond_to? :from_data_hash
-              tmp = Puppet::Resource::Catalog.from_data_hash tmp
-            else
-              # The method was renamed in 3.5.0
-              tmp = Puppet::Resource::Catalog.from_pson tmp
+          if Puppet::Util::Package.versioncmp(Puppet.version, '4.0.0') < 0
+            # If we're still in Puppet 3.X, use the 3.X loading method
+            tmp = PSON.load(File.read(r))
+            unless tmp.respond_to? :version
+              if Puppet::Resource::Catalog.respond_to? :from_data_hash
+                tmp = Puppet::Resource::Catalog.from_data_hash tmp
+              else
+                # The method was renamed in 3.5.0
+                tmp = Puppet::Resource::Catalog.from_pson tmp
+              end
             end
+          else
+
+            # Puppet 4 Method of loading the pson is quite different than 3.X
+            raw_content = File.read(r)
+            tmp = Puppet::Resource::Catalog.convert_from(:pson, raw_content)
           end
         when '.json'
+          if Puppet::Util::Package.versioncmp(Puppet.version, '4.0.0') <= 0
+            raise "Loading JSON files will not work when using puppet-diff on Puppet 4.X"
+          end
+
           if Puppet::Resource::Catalog.respond_to? :from_data_hash
             tmp = Puppet::Resource::Catalog.from_data_hash JSON.load(File.read(r))
           else
             # The method was renamed in 3.5.0
             tmp = Puppet::Resource::Catalog.from_pson JSON.load(File.read(r))
           end
-        else
+       else
           raise "Provide catalog with the appropriate file extension, valid extensions are pson, yaml and marshal"
         end
 
@@ -88,8 +100,8 @@ def diff(options = {})
 
 
       resource_diffs_titles = return_resource_diffs(titles[:to], titles[:from])
-      output[:only_in_old] = resource_diffs_titles[:titles_only_in_old]
-      output[:only_in_new] = resource_diffs_titles[:titles_only_in_new]
+      output[:only_in_old] = resource_diffs_titles[:titles_only_in_old].sort
+      output[:only_in_new] = resource_diffs_titles[:titles_only_in_new].sort
 
       resource_diffs = compare_resources(from,to,options)
       output[:differences_in_old]  = resource_diffs[:old]
diff --git a/lib/puppet/catalog-diff/formater.rb b/lib/puppet/catalog-diff/formater.rb
index 7cff1a7..bc1a6aa 100644
--- a/lib/puppet/catalog-diff/formater.rb
+++ b/lib/puppet/catalog-diff/formater.rb
@@ -141,5 +141,26 @@ def render_pull(output)
         end
       end.join("\n") + "#{self.node_summary_header("#{output[:failed_nodes_total]} out of #{output[:total_nodes]} nodes failed to compile. failure rate:",output,:total_percentage)}"
     end
+
+    def param_diff(resource_list, old, new)
+      results = resource_list.collect do |resource|
+        output = String.new
+        old_resource = old[resource]
+        new_resource = new[resource]
+
+        params = Set.new
+        params.merge old_resource.keys
+        params.merge new_resource.keys
+
+        output << "\t\033[1m#{resource}\033[0m:\n"
+        params.each do |param|
+          output << "\t\tOld Value: #{old_resource[param] || "UNDEF"}\n"
+          output << "\t\tNew Value: #{new_resource[param] || "UNDEF"}\n"
+          output << "\n"
+        end
+
+        output
+      end.join
+    end
   end
 end
diff --git a/lib/puppet/face/catalog/diff.rb b/lib/puppet/face/catalog/diff.rb
index d2f6499..bf0106e 100644
--- a/lib/puppet/face/catalog/diff.rb
+++ b/lib/puppet/face/catalog/diff.rb
@@ -29,8 +29,8 @@
       summary "Whether to show a diff for File resource content"
     end
 
-    option '--show_resource_diff' do
-      summary 'Display differeces between resources in unified diff format'
+    option '--no_resource_diff' do
+      summary 'Do not display differeces between resources in unified diff format'
     end
 
     option '--exclude_classes' do
@@ -162,11 +162,11 @@
 
       with_changes = nodes.select { |node,summary| summary.is_a?(Hash) && !summary[:node_percentage].zero? }
       most_changed = with_changes.sort_by {|node,summary| summary[:node_percentage]}.map do |node,summary|
-         Hash[node => summary[:node_percentage]]
+        Hash[node => summary[:node_percentage]]
       end
 
       most_differences = with_changes.sort_by {|node,summary| summary[:node_differences]}.map do |node,summary|
-         Hash[node => summary[:node_differences]]
+        Hash[node => summary[:node_differences]]
       end
       total_nodes        = nodes.size
       nodes[:total_percentage]   = (nodes.collect{|node,summary| summary.is_a?(Hash) && summary[:node_percentage] || nil }.compact.inject{|sum,x| sum.to_f + x } / total_nodes)
@@ -182,35 +182,46 @@
       require File.expand_path(File.join(File.dirname(__FILE__), "..", "..", "catalog-diff", "formater.rb"))
 
       format = Puppet::CatalogDiff::Formater.new()
+      report = String.new
+
       nodes.collect do |node,summary|
-      next if node == :total_percentage or node == :total_nodes or node == :most_changed or node == :with_changes or node == :most_differences or node == :pull_output or node == :date
-      format.node_summary_header(node,summary,:node_percentage) + summary.collect do |header,value|
-        next if value.nil?
-        if value.is_a?(Hash)
-          value.collect do |resource_id,resource|
-            next if resource.nil?
-            if resource.is_a?(Hash) && resource.has_key?(:type)
-              # If we find an actual resource print it out
-              format.resource_reference(header,resource_id,resource)
-            elsif resource.is_a?(Array)
-              next unless resource.any?
-              # Format string diffs
-              format.string_diff(header,resource_id,resource)
-            else
+        next if [:total_percentage, :total_nodes, :most_changed, :with_changes, :most_differences, :pull_output, :date].include? node
+        report << format.node_summary_header(node,summary,:node_percentage)
+
+        report << summary.collect do |header,value|
+          next if ([:params_in_new, :params_in_old].include? header) or value.nil?
+          if value.is_a?(Hash)
+            value.collect do |resource_id,resource|
               next if resource.nil?
-              # Format hash diffs
-              format.params_diff(header,resource_id,resource)
+              if resource.is_a?(Hash) && resource.has_key?(:type)
+                # If we find an actual resource print it out
+                format.resource_reference(header,resource_id,resource)
+              elsif resource.is_a?(Array)
+                next unless resource.any?
+                # Format string diffs
+                format.string_diff(header,resource_id,resource)
+              else
+                next if resource.nil?
+                # Format hash diffs
+                format.params_diff(header,resource_id,resource)
+              end
             end
+          elsif value.is_a?(Array)
+            next if value.empty?
+            # Format arrays
+            format.list(header,value)
+          else
+            format.key_pair(header,value)
           end
-        elsif value.is_a?(Array)
-          next if value.empty?
-          # Format arrays
-          format.list(header,value)
-        else
-          format.key_pair(header,value)
-        end
         end.delete_if {|x| x.nil? or x == []  }.join("\n")
-      end.join("\n") + "#{format.node_summary_header("#{nodes[:with_changes]} out of #{nodes[:total_nodes]} nodes changed.",nodes,:total_percentage)}\n#{format.list_hash("Nodes with the most changes by percent changed",nodes[:most_changed])}\n\n#{format.list_hash("Nodes with the most changes by differeces",nodes[:most_differences],'')}#{(nodes.has_key?(:pull_output) && format.render_pull(nodes[:pull_output]))}"
+
+        report << "\033Parameter differences across catalogs:\033[0m:\n"
+        report << format.param_diff(summary[:params_in_new].keys, summary[:params_in_old], summary[:params_in_new])
+      end.join("\n")
+
+      report << "#{format.node_summary_header("#{nodes[:with_changes]} out of #{nodes[:total_nodes]} nodes changed.",nodes,:total_percentage)}\n"
+      report << "#{format.list_hash("Nodes with the most changes by percent changed",nodes[:most_changed])}\n\n"
+      report << "#{format.list_hash("Nodes with the most changes by differeces",nodes[:most_differences],'')}#{(nodes.has_key?(:pull_output) && format.render_pull(nodes[:pull_output]))}"
     end
   end
 end